So long as the zoos are closed, they will not absorb much of the toxic conditions. Keep them, watch them closely. Chances are they will let you know when the tank is well again by opening back up again. If by some chance they do go RTN on you, frag the bad ones off, toss those and keep the rest till they prove unhealthy. The odds are in their favor for survival though. Really a pretty small tank for a RBTA of any size. Tanks that small usually don't meet light needs first, then other needs such as plankton production. Very hard to constantly meet conditions for many things in a nano. They are labor intensive at this size.
